Pyrite suns or pyrite dollars are a unusual pyrite formation exhibiting striations radiating out from the center like rays of the sun. They are found in narrow, compacted seams of slate interbedded in the 300 million year old coal deposits near Sparta, Illinois. People used to believe that pyrite suns were fossils which had undergone pyrite replacement. The current consensus is that they are simply formed due to the enormous pressure compacting the slate, and causing pyrite to grow laterally in a radiating manner.
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PYRITE SUNS FOR SALE

: $17 to $39